Bad Weather & Night Driving — Wyoming
Wyoming CDL practice test: 459 free practice questions (Based on the official driver handbook). The official format is not yet verified; check the official site before your test. Bad Weather & Night Driving: 20 questions.
Rain, snow, ice, fog and night driving: visibility, traction and headlight use.
This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines.
| Topic / Metric | Value |
|---|---|
| Topic | Bad Weather & Night Driving |
| License test | Wyoming CDL permit (CLP) knowledge tests |
| Topic questions | 20 (4% of 459 total) |
| Review status | This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines. |
Official handbook
Not yet verified
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Questions (20)
1. If unable to tell if the road is becoming icy and slippery, a driver:
- Should try guessing.
- May open their window and feel the front of the side mirror for ice. ✓
- Should look at the road closely.
Answer: B. May open their window and feel the front of the side mirror for ice.
Open your window and feel the front of the side mirror for ice; that is the handbook's simple check when you cannot tell whether the road is icing up. The Texas CDL handbook says it can be hard to know when a road is slippery, so it gives signs to check. One easy check is to open the window and feel the front of the mirror, mirror support, or antenna. If ice is there, the road surface is probably starting to ice up. A later section also tells drivers to check mirrors and wiper blades for ice and treat the road as likely icy if they find it. That supports using the mirror as a practical ice detector rather than guessing.
2. A thin layer of ice that forms on road surfaces is called:
- White ice.
- Black ice. ✓
- Green ice.
- Blue ice.
Answer: B. Black ice.
The thin layer of ice on a road surface is called black ice. The handbook describes black ice as a thin, clear layer that lets you see the pavement under it and makes the road look wet. It says to watch for black ice whenever the temperature is below freezing and the road looks wet. That description matches the question exactly, so the thin layer of ice is called black ice.
3. An air supply control in its "emergency" position will:
- Turn on the air supply.
- Apply the trailer emergency brakes. ✓
- Prevent a skid.
- Accelerate the vehicle.
Answer: B. Apply the trailer emergency brakes.
An air supply control in the "emergency" position applies the trailer emergency brakes. The handbook describes the trailer air supply control as the valve you use to manage the tractor protection valve. Pushing it in sends air to the trailer; pulling it out cuts that air off and sets the trailer emergency brakes. The same section says the emergency position is for shutting off the air and applying those brakes, while normal is for pulling a trailer. That matches the answer.
4. When other vehicles have trouble seeing you at dawn or dusk, you can increase your visibility by:
- Turning on your four-way flashers.
- Honking your horn.
- Turning on your headlights. ✓
- Turning on your windshield wipers.
Answer: C. Turning on your headlights.
Turning on your headlights is the way to increase your visibility to other drivers at dawn or dusk. The handbook says that at dawn, dusk, rain, or snow you need to make yourself easier to see. It points out that if you have trouble seeing other vehicles, they likely have trouble seeing you. The instruction is to turn on your lights, and specifically to use your headlights, not just the identification or clearance lights. It also says to use low beams because high beams can bother other people. Turning on your headlights helps other drivers notice your vehicle.
5. If a trailer begins to skid, the driver should:
- Lock the brakes.
- Release the brakes. ✓
- Steer in the opposite direction.
- Accelerate.
Answer: B. Release the brakes.
Release the brakes so the trailer wheels can regain traction. The handbook says that when a trailer starts to skid, you should release the brakes to get traction back. It explains that the trailer wheel brakes caused the skid, so using the trailer hand brake to try to straighten the rig is the wrong move. Once the trailer wheels grip the road again, the trailer will follow the tractor and straighten out.
6. When driving in fog, you should:
- Slow down. ✓
- Speed up.
- Drive on the shoulder.
Answer: A. Slow down.
Slow down when driving in fog. The handbook warns that fog can appear without warning and visibility can drop fast. It says to be ready to reduce speed and to slow down before you enter fog. If fog is bad enough, it is better to pull off the road into a rest area or truck stop than to keep driving. That supports slowing down rather than trying to drive faster or treating the shoulder as a travel lane.
7. On a wet road, you should reduce your speed:
- By about one-half.
- By about one-third. ✓
- By about one-quarter.
- By about one-eighth.
Answer: B. By about one-third.
On a wet road, reduce your speed by about one-third. The handbook says traction is friction between the tires and the road, and wet roads can double stopping distance. Because it takes longer to stop and is harder to turn without skidding, you need to drive slower to stop in the same distance as on a dry road. The handbook specifically says to reduce speed by about one-third on a wet road, giving an example of slowing from 55 to about 35 mph. That directly supports reducing speed by about one-third.
8. As temperatures begin to rise and ice on road surfaces begin to melt:
- It is especially safe to drive.
- The road will become more slippery. ✓
- Traction will increase.
- It will be easier to identify slippery spots.
Answer: B. The road will become more slippery.
When ice starts to melt as temperatures rise, the road will become more slippery. The handbook warns that when the temperature climbs to where ice begins melting, the surface gets even more slippery, so you should slow down more. That is why the correct choice is that the road becomes more slippery. Melting ice turns wet, and the handbook says wet ice is much more slippery than ice that is not wet. This is a traction problem, not an improvement.
9. Using the trailer hand valve while driving:
- Will help you turn safely.
- Will stop your trailer safely.
- Can cause a skid. ✓
- Is impossible.
Answer: C. Can cause a skid.
Using the trailer hand valve while driving can cause a skid. The handbook says the trailer hand valve (also called the trolley valve or Johnson bar) should be used only to test the trailer brakes. You should not use it in driving, because it creates a danger of making the trailer skid. The foot brake applies air to all the brakes on the vehicle, including the trailer, and the handbook states there is much less danger of a skid or jackknife with the foot brake alone. That is why the hand valve stays a testing tool, not a driving control.
10. If your vehicle is hydroplaning, you should:
- Use the accelerator.
- Not use the brakes. ✓
- Put the vehicle in a higher gear.
Answer: B. Not use the brakes.
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Last checked: 2026-10-17 · Verified from official source
Updated: · Based on the official driver handbook